CN111060817A - EGS grounding protection switch safety detection device and detection method - Google Patents
EGS grounding protection switch safety detection device and detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 230000006698 induction Effects 0.000 claims description 33
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 10
- 238000012806 monitoring device Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
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- 230000005283 ground state Effects 0.000 claims description 3
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- 238000013473 artificial intelligence Methods 0.000 description 2
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- 238000009434 installation Methods 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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Abstract
The invention discloses a safety detection device and a detection method for an EGS grounding protection switch, which detect whether induced current exists in the front and the back of an EGS main body by respectively arranging a first current transformer and a second current transformer, can judge that grounding is successful if the first current transformer and the second current transformer both induce the induced current, discharge at the high-voltage cable side through the EGS main body, can judge that grounding is failed if the first current transformer does not induce the induced current and the second current transformer can induce the induced current, an overcurrent relay detection module is used for controlling an alarm indication module to display corresponding states so as to remind maintainers of paying attention, and can transmit the corresponding states to a train display screen through a data conversion module for a driver to check and detect whether the EGS grounding protection switch is really and safely conducted and grounded, the safety is high.
Description
Technical Field
The invention relates to the field of bullet train safety detection, in particular to an EGS grounding protection switch safety detection device and a detection method.
Background
An electric multiple unit ground protection switch (EGS emergency ground switch) is a device for grounding under the condition that a vacuum circuit breaker cannot cut off a main circuit, or preventing a pantograph from rising accidentally after a vehicle returns to a garage, grounding the pantograph in advance, avoiding electric shock accidents, and discharging a capacitor in a high-voltage device to the ground. The existing grounding protection switch for loading only carries out simple switch blade action position state detection by a limit switch for detecting mechanical action in a control box, or judges the mechanical position state of a switch blade through the rotating angle of a cam fixed on a rotating shaft of a swing cylinder, and cannot detect whether a circuit is safely conducted and grounded after action, so that great potential safety hazard exists.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides a device and a method for detecting safety of an EGS grounding protection switch, which can detect whether the EGS grounding protection switch is really and safely conducted and grounded and have higher safety.
According to the embodiment of the first aspect of the invention, the EGS grounding protection switch safety detection device comprises:
the high-voltage circuit comprises a high-voltage cable side, an EGS high-voltage side connecting copper bar and an EGS main body which are sequentially connected, wherein the EGS main body is provided with a grounding knife switch for connecting an EGS grounding point;
a first current transformer wound between the EGS body and the EGS ground;
the overcurrent relay detection module is connected with the first current transformer;
the second current transformer is wound between the high-voltage cable side and the EGS high-voltage side wiring copper bar;
the current difference judging device is respectively connected with the second current transformer and the overcurrent relay detection module;
the alarm indication module is connected with the overcurrent relay detection module;
the data conversion module is connected with the overcurrent relay detection module;
train terminal module, including train display screen, train network terminal and train DRWTD device, the train display screen the train network terminal with train DRWTD device respectively with the data conversion module is connected, the train display screen is used for supplying the driver to look over the ground state of EGS main part to report to the police and indicate and show and EGS plug monitoring image shows, the train network terminal be used for with the data that conversion module transmission was come handles the transmission, train DRWTD device be used for with the data that conversion module transmission was come is saved.
According to the safety detection device of the EGS ground protection switch in the embodiment of the first aspect of the invention, at least the following beneficial effects are achieved: whether induced currents exist in the front and the back of the EGS main body or not is detected by respectively arranging a first current transformer and a second current transformer, if the induced currents are induced by the first current transformer and the second current transformer, the successful grounding can be judged, and the high-voltage cable side discharges through the EGS main body; if the first current transformer installed on the high-voltage cable side does not induce induction current, and the second current transformer induces induction current, the fact that the high-voltage side current flows through the second current transformer and weak current discharging phenomenon can be judged, however, because the switch is not switched on, the situation that the first current transformer does not have induction current appears, and at the moment, the grounding failure is judged, the overcurrent relay detection module is used for controlling the alarm indication module to visually display the corresponding state, so that the attention of maintenance personnel is reminded, the overcurrent relay detection module can also transmit the corresponding state to a train display screen through the data conversion module, a driver can check the state, whether the EGS grounding protection switch is really and safely conducted to be grounded can be detected, and the safety is high.
In some embodiments of the present invention, the alarm indication module includes a buzzer and an indicator light, and the buzzer and the indicator light are respectively connected to the overcurrent relay detection module. Set up bee calling organ and pilot lamp and can send sound warning and light warning respectively, wherein the pilot lamp can set up red light and green light respectively, and the red light is used for warning dangerous condition, and green light is used for instructing the safe condition.
In some embodiments of the present invention, the apparatus further comprises a camera for shooting the connection state of the grounding knife switch, and the camera is connected to the overcurrent relay detection module and the data conversion module. Set up the connection status that the camera is used for shooing ground connection plug-in strip, through installing in high definition digtal camera's artificial intelligence image recognition system, carry out data contrastive analysis with standard plug-in strip state and present plug-in strip state, can find whether ground connection plug-in strip exists failures such as contact failure and earth connection fracture, further investigate whether there is ground connection failure.
In some embodiments of the present invention, a remote control/monitoring device is further included, and the remote control/monitoring device is connected with the camera. And a remote control/monitoring device is arranged, so that a maintainer can carry out remote troubleshooting.
In some embodiments of the present invention, the EGS main body further includes an EGS control loop connector, and the EGS control loop connector is respectively connected to the current difference determination device and the camera.
The safety detection method for the EGS ground protection switch according to the embodiment of the second aspect of the invention is applied to the safety detection device for the EGS ground protection switch according to the embodiment of the first aspect of the invention, and comprises the following steps:
after a grounding switch of the EGS main body is switched on, if a first current transformer induces induction current, the induction current is transmitted to an alarm indication module through an overcurrent relay detection module, the alarm indication module adopts a buzzer to alarm and a red warning lamp is turned on to indicate that a train is discharging, meanwhile, the overcurrent relay detection module transmits data to a data conversion device, and the data conversion device transmits the data to a train display screen for a train driver to check;
if the train discharges and finishes, through overflowing the relay detection module, transmit the signal to the alarm indication module, the alarm indication module stops the buzzer and reports to the police to bright green pilot lamp, show that the train discharges and finishes, overflow the relay detection module transmission data and give the data conversion equipment simultaneously, the data conversion equipment transmits the train display screen, supplies the train driver to look over.
In some embodiments of the invention, further comprising:
after the grounding knife switch of the EGS main body is switched on, if the first current transformer does not induce induction current, the second current transformer induces induction current, the current difference judging device obtains induction current data of the first current transformer through the overcurrent relay detection module, the induction current data are compared, a result is output to the overcurrent relay detection module, the overcurrent relay detection module controls the alarm indication module to give an alarm through the buzzer and light a red light, and grounding failure of the grounding knife switch of the EGS main body is indicated. The high-voltage side current flows through the second current transformer and has weak current discharge, but the situation that the first current transformer has no induced current occurs because the switch is not switched on.
In some embodiments of the invention, further comprising:
if the grounding knife switch of the EGS main body is in a grounding state, the train is in a maintenance state, the first current transformer senses induced current, the overcurrent relay detection module controls the alarm indication module to give an alarm through the buzzer and light a red light to indicate that the train mistakenly rises and the bow is electrified, meanwhile, the data conversion device transmits data to the train display screen through the overcurrent relay detection module, and a train driver or a maintenance person can check the data.
In some embodiments of the invention, further comprising:
if the emergency condition is switched on and grounded through a grounding knife switch of the EGS main body during the operation of the train, and the first current transformer induces induction current, the overcurrent relay detection module controls the alarm indication module to give an alarm through a buzzer and light a red light to indicate that the grounding is successful, and meanwhile, the overcurrent relay detection module transmits data to the data conversion device, and the data conversion device transmits the data to a train display screen for a train driver to check; if the first current transformer does not induce induction current, the grounding is judged to be unsuccessful, and the data conversion device transmits the induction current to the train display screen to remind a train driver to forcibly lower the bow, so that more serious consequences are avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
fig. 1 is a schematic diagram of an EGS ground protection switch safety detection device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an EGS ground protection switch;
FIG. 3 is a front view of an exterior view of an EGS ground protection switch;
FIG. 4 is a side view of an EGS ground protection switch profile;
fig. 5 is a top view of an outline of an EGS ground protection switch.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
An electric multiple unit ground protection switch (EGS emergency ground switch) is a device for grounding when a vacuum circuit breaker cannot cut off a main circuit, or preventing a pantograph from rising accidentally after a vehicle returns to a garage, grounding the pantograph in advance, preventing an electric shock accident, and discharging internal capacitance of high-voltage equipment, as shown in fig. 2 to 5. The existing grounding protection switch for loading only carries out simple switch blade action position state detection by a limit switch for detecting mechanical action in a control box, or judges the mechanical position state of a switch blade through the rotating angle of a cam fixed on a rotating shaft of a swing cylinder, and cannot detect whether a circuit is safely conducted and grounded after action, so that great potential safety hazard exists.
The potential hazards of the EGS grounding protection switch include: the brake shoe is characterized by comprising limit switch clamping stagnation (the amount of conductive grease is too small or not coated), limit switch action position deviation, knife switch clamping piece loosening and non-contact, poor contact (the cross section of the knife switch is oval and the contact surface is small), knife switch rusting, contact deformation, knife switch and knife switch holder non-contact caused by the external environment in the train operation process, braided grounding wire fracture (the condition that the existing train is blown by wind when the grounding wire is in the external environment for a long time, the train vibrates and interferes with the train body to cause partial grounding wire fracture), grounding wire and mounting seat non-contact (bolt loosening) and the like. And the condition that the burning loss of the grounding braided wire is not found and the grounding cannot be safely performed due to no record of the previous false arch lifting is solved.
At present, single mechanical action position judgment is carried out through a limit switch, the situation that EGS false grounding is possibly caused by no electric detection equipment is provided, and accidental pantograph lifting is caused when grounding occurs without an alarm device, so that a vehicle body is provided with high voltage and burns out equipment or electric shock accidents of operating personnel occur, false discharging of internal capacitors of the high voltage equipment occurs, the equipment is burnt out, or inexperienced maintenance operating personnel are not clear of the discharging process and directly contact the vehicle body or the high voltage equipment under the condition of no discharging to cause the electric shock accidents, and the EGS false grounding is caused when a vacuum circuit breaker cannot cut off a main circuit.
① before the train warehouse maintenance, detecting whether the EGS capacitor discharges completely, ② judging whether the EGS is grounded safely, ③ alarming when the pantograph rises by mistake, and being provided with a data transmission and conversion device, feeding back to a train network system through a data transmission line, displaying and reminding a driver on a network system display screen to detect the grounding conduction of the grounding protection switch after the pantograph rises by mistake, checking whether equipment is burnt and damaged, and whether a grounding braided wire is burnt and broken, ④ judging whether the vacuum circuit breaker cannot be broken when the emergency occurs in the train operation process, and judging whether the grounding is successful when the forced grounding needs to be conducted through the EGS grounding protection switch, and rapidly transmitting a signal to the display screen through the data conversion device, and forcibly lowering the pantograph by the driver.
Referring to fig. 1, an EGS ground protection switch safety detection device according to an embodiment of the first aspect of the present invention includes:
the high-voltage circuit comprises a high-voltage cable side, an EGS high-voltage side connecting copper bar and an EGS main body which are sequentially connected, wherein the EGS main body is provided with a grounding knife switch for connecting an EGS grounding point;
a first current transformer wound between the EGS body and the EGS ground;
the overcurrent relay detection module is connected with the first current transformer;
the second current transformer is wound between the high-voltage cable side and the EGS high-voltage side wiring copper bar;
the current difference judging device is respectively connected with the second current transformer and the overcurrent relay detection module;
the alarm indication module is connected with the overcurrent relay detection module;
the data conversion module is connected with the overcurrent relay detection module;
train terminal module, including train display screen, train network terminal and train DRWTD device, the train display screen the train network terminal with train DRWTD device respectively with the data conversion module is connected, the train display screen is used for supplying the driver to look over the ground state of EGS main part to report to the police and indicate and show and EGS plug monitoring image shows, the train network terminal be used for with the data that conversion module transmission was come handles the transmission, train DRWTD device be used for with the data that conversion module transmission was come is saved.
According to the safety detection device for the EGS grounding protection switch, provided by the embodiment of the first aspect of the invention, whether induced current exists in the front and at the back of the EGS main body or not is detected by respectively arranging the first current transformer and the second current transformer, if the induced current is induced by both the first current transformer and the second current transformer, the successful grounding can be judged, and the high-voltage cable side discharges through the EGS main body; if the first current transformer installed on the high-voltage cable side does not induce induction current, and the second current transformer induces induction current, the fact that the high-voltage side current flows through the second current transformer and weak current discharging phenomenon can be judged, however, because the switch is not switched on, the situation that the first current transformer does not have induction current appears, and at the moment, the grounding failure is judged, the overcurrent relay detection module is used for controlling the alarm indication module to visually display the corresponding state, so that the attention of maintenance personnel is reminded, the overcurrent relay detection module can also transmit the corresponding state to a train display screen through the data conversion module, a driver can check the state, whether the EGS grounding protection switch is really and safely conducted to be grounded can be detected, and the safety is high.
The current difference determination device, the overcurrent relay detection module and the data conversion module all belong to common modules and devices in the prior art, and can be implemented by using a traditional hardware circuit or a control chip in cooperation with software programming configuration, which is not limited in this embodiment.
In some embodiments of the present invention, the alarm indication module includes a buzzer and an indicator light, and the buzzer and the indicator light are respectively connected to the overcurrent relay detection module. Set up bee calling organ and pilot lamp and can send sound warning and light warning respectively, wherein the pilot lamp can set up red light and green light respectively, and the red light is used for warning dangerous condition, and green light is used for instructing the safe condition.
In some embodiments of the present invention, the apparatus further comprises a camera for shooting the connection state of the grounding knife switch, and the camera is connected to the overcurrent relay detection module and the data conversion module. Set up the connection status that the camera is used for shooing ground connection plug-in strip, through installing in high definition digtal camera's artificial intelligence image recognition system, carry out data contrastive analysis with standard plug-in strip state and present plug-in strip state, can find whether ground connection plug-in strip exists failures such as contact failure and earth connection fracture, further investigate whether there is ground connection failure. The installation position of the camera is not specifically limited as long as the camera can shoot the connection state of the grounding knife switch.
In some embodiments of the present invention, a remote control/monitoring device is further included, and the remote control/monitoring device is connected with the camera. And a remote control/monitoring device is arranged, so that a maintainer can carry out remote troubleshooting.
In some embodiments of the present invention, the EGS main body further includes an EGS control loop connector, and the EGS control loop connector is respectively connected to the current difference determination device and the camera.
The embodiment of the second aspect of the present invention provides a safety detection method for an EGS ground protection switch, which is applied to the safety detection device for an EGS ground protection switch according to the embodiment of the first aspect of the present invention, and the safety detection method comprises the following steps:
after a grounding switch of the EGS main body is switched on, if a first current transformer induces induction current, the induction current is transmitted to an alarm indication module through an overcurrent relay detection module, the alarm indication module adopts a buzzer to alarm and a red warning lamp is turned on to indicate that a train is discharging, meanwhile, the overcurrent relay detection module transmits data to a data conversion device, and the data conversion device transmits the data to a train display screen for a train driver to check;
if the train discharges and finishes, through overflowing the relay detection module, transmit the signal to the alarm indication module, the alarm indication module stops the buzzer and reports to the police to bright green pilot lamp, show that the train discharges and finishes, overflow the relay detection module transmission data and give the data conversion equipment simultaneously, the data conversion equipment transmits the train display screen, supplies the train driver to look over.
In some embodiments of the invention, further comprising:
after the grounding knife switch of the EGS main body is switched on, if the first current transformer installed on the high-voltage cable side does not induce induction current and the second current transformer induces induction current, the fact that the current on the high-voltage side flows through the second current transformer and weak current discharge occurs can be judged, but the situation that the first current transformer does not induce current occurs because the knife switch is not switched on, the grounding failure is judged at the moment, the current difference judging device obtains the induction current data of the first current transformer through the overcurrent relay detection module, the induction current data are compared and then output to the overcurrent relay detection module, the overcurrent relay detection module controls the alarm indication module to give an alarm through the buzzer and light a red light, and the grounding failure of the grounding knife switch of the EGS main body is indicated.
In some embodiments of the invention, further comprising:
if the grounding knife switch of the EGS main body is in a grounding state, the train is in a maintenance state, the first current transformer senses induced current, the overcurrent relay detection module controls the alarm indication module to give an alarm through the buzzer and light a red light to indicate that the train mistakenly rises and the bow is electrified, meanwhile, the data conversion device transmits data to the train display screen through the overcurrent relay detection module, and a train driver or a maintenance person can check the data.
In some embodiments of the invention, further comprising:
if the emergency condition is switched on and grounded through a grounding knife switch of the EGS main body during the operation of the train, and the first current transformer induces induction current, the overcurrent relay detection module controls the alarm indication module to give an alarm through a buzzer and light a red light to indicate that the grounding is successful, and meanwhile, the overcurrent relay detection module transmits data to the data conversion device, and the data conversion device transmits the data to a train display screen for a train driver to check; if the first current transformer does not induce induction current, the grounding is judged to be unsuccessful, and the data conversion device transmits the induction current to the train display screen to remind a train driver to forcibly lower the bow, so that more serious consequences are avoided.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. An EGS ground protection switch safety detection device, characterized by includes:
the high-voltage circuit comprises a high-voltage cable side, an EGS high-voltage side connecting copper bar and an EGS main body which are sequentially connected, wherein the EGS main body is provided with a grounding knife switch for connecting an EGS grounding point;
a first current transformer wound between the EGS body and the EGS ground;
the overcurrent relay detection module is connected with the first current transformer;
the second current transformer is wound between the high-voltage cable side and the EGS high-voltage side wiring copper bar;
the current difference judging device is respectively connected with the second current transformer and the overcurrent relay detection module;
the alarm indication module is connected with the overcurrent relay detection module;
the data conversion module is connected with the overcurrent relay detection module;
train terminal module, including train display screen, train network terminal and train DRWTD device, the train display screen the train network terminal with train DRWTD device respectively with the data conversion module is connected, the train display screen is used for supplying the driver to look over the ground state of EGS main part to report to the police and indicate and show and EGS plug monitoring image shows, the train network terminal be used for with the data that conversion module transmission was come handles the transmission, train DRWTD device be used for with the data that conversion module transmission was come is saved.
2. The safety detection device for the EGS grounding protection switch as claimed in claim 1, wherein the alarm indication module comprises a buzzer and an indicator light, and the buzzer and the indicator light are respectively connected with the overcurrent relay detection module.
3. The safety detection device for the EGS grounding protection switch as claimed in claim 1, further comprising a camera for shooting the connection state of the grounding switch blade, wherein the camera is connected with the overcurrent relay detection module and the data conversion module.
4. The EGS grounding protection switch safety detection device as claimed in claim 3, further comprising a remote control/monitoring device, wherein the remote control/monitoring device is connected with the camera.
5. The EGS grounding protection switch safety detection device as claimed in claim 3, wherein the EGS main body further comprises an EGS control loop connector, and the EGS control loop connector is respectively connected with the current difference judgment device and the camera.
6. A safety detection method for an EGS grounding protection switch, which is applied to the safety detection device for the EGS grounding protection switch of any one of claims 1-5, is characterized by comprising the following steps:
after a grounding switch of the EGS main body is switched on, if a first current transformer induces induction current, the induction current is transmitted to an alarm indication module through an overcurrent relay detection module, the alarm indication module adopts a buzzer to alarm and a red warning lamp is turned on to indicate that a train is discharging, meanwhile, the overcurrent relay detection module transmits data to a data conversion device, and the data conversion device transmits the data to a train display screen for a train driver to check;
if the train discharges and finishes, through overflowing the relay detection module, transmit the signal to the alarm indication module, the alarm indication module stops the buzzer and reports to the police to bright green pilot lamp, show that the train discharges and finishes, overflow the relay detection module transmission data and give the data conversion equipment simultaneously, the data conversion equipment transmits the train display screen, supplies the train driver to look over.
7. The safety detection method for the EGS grounding protection switch as claimed in claim 6, further comprising:
after the grounding knife switch of the EGS main body is switched on, if the first current transformer does not induce induction current, the second current transformer induces induction current, the current difference judging device obtains induction current data of the first current transformer through the overcurrent relay detection module, the induction current data are compared, a result is output to the overcurrent relay detection module, the overcurrent relay detection module controls the alarm indication module to give an alarm through the buzzer and light a red light, and grounding failure of the grounding knife switch of the EGS main body is indicated.
8. The safety detection method for the EGS grounding protection switch as claimed in claim 6, further comprising:
if the grounding knife switch of the EGS main body is in a grounding state, the train is in a maintenance state, the first current transformer senses induced current, the overcurrent relay detection module controls the alarm indication module to give an alarm through the buzzer and light a red light to indicate that the train mistakenly rises and the bow is electrified, meanwhile, the data conversion device transmits data to the train display screen through the overcurrent relay detection module, and a train driver or a maintenance person can check the data.
9. The safety detection method for the EGS grounding protection switch as claimed in claim 6, further comprising:
if the emergency condition is switched on and grounded through a grounding knife switch of the EGS main body during the operation of the train, and the first current transformer induces induction current, the overcurrent relay detection module controls the alarm indication module to give an alarm through a buzzer and light a red light to indicate that the grounding is successful, and meanwhile, the overcurrent relay detection module transmits data to the data conversion device, and the data conversion device transmits the data to a train display screen for a train driver to check; if the first current transformer does not induce induction current, the grounding is judged to be unsuccessful, and the data conversion device transmits the induction current to the train display screen.
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